In order to obtain exclusive rights on an invention the law requires that the patent applicant particularly point out and distinctly claim the subject matter which. Type or paste a DOI name into the text box. Click Go. Your browser will take you to a Web page URL associated with that DOI name. Send questions or comments to doi. Alloying Understanding The Basics' title='Alloying Understanding The Basics' />Aluminum Experience in Application. In recent years, the use of aluminum in manufacturing has become more prevalent because of its light weight and other attributes that make it an attractive alternative to steel. In fact, the aluminum welding market is expected to grow at a rate of 5. But, those experienced in the welding of steel will find aluminum to be a different breed the normal welding characteristics of steel dont always apply to aluminum. For example, aluminums high thermal conductivity and low melting point can easily lead to burnthrough and warpage problems if proper procedures are not followed. In this article, we will first take a look at various alloying elements and how they affect aluminum then we will turn our attention to welding procedures and the parameters that will create the best quality weld. Lastly, we will examine some new technology breakthroughs that make welding aluminum a little easier. Alloying Elements To understand aluminum, you must first understand some basics about aluminum metallurgy. Aluminum can be alloyed with a number of different elements, both primary and secondary, to provide improved strength, corrosion resistance andor general weldability. The primary elements that alloy with aluminum are copper, silicon, manganese, magnesium and zinc. Alloying Understanding The Basics' title='Alloying Understanding The Basics' />But, before we examine them in detail and what they bring to aluminum, it is important to note that these alloys fall into two classes heat treatable or nonheat treatable. Heat Treatable vs. Nonheat Treatable Alloys. Heat treatable alloys are those that can be heated after welding to regain strength lost during the welding process. To heat treat an alloy means heating it at a high temperature, putting the alloying elements into solid solution and then cooling it at a rate which will produce a supersaturated solution. The next step in the process is to maintain it at a lower temperature long enough to allow a controlled amount of precipitation of the alloying elements. With the nonheat treatable alloys it is possible to increase strength through cold working or strain hardening. To do this, a mechanical deformation must occur in the metal structure, resulting in increased resistance to strain, producing higher strength and lower ductility. Further Distinctions. To further designate aluminum alloys, they can also be classified by a temper designation which are as follows F As fabricated, O Annealed, H Strain hardened W Solution heat treated and T Thermally treated, which can designated heat treatment, or cold working aging. For example an alloy may carry the designation of 2. T6. This means that it is alloyed with copper 2. XXX series and the T6 refers to the fact that it is solution heat treated and artificially aged. For purposes of this article, we will discuss wrought alloys, which are those aluminum alloys that are rolled from ingot or extruded with customer specified shapes. But please note that alloys can also be divided into cast alloys. Cast alloys are those used to manufacture parts from molten alloys of aluminum poured into molds. Cast alloys are precipitation hardenable but never strain hardenable. The weldability of these alloys is affected by casting type permanent mold, die cast, and sand since the casting surface is critical to welding success. A three digit number, plus one decimal i. Weldable grades of aluminum castings are 3. Alloying Elements. Now, that you understand some of the terminology, lets take a look at the different alloying elements Copper which carries a wrought alloy designation of 2. XXX series provides high strength to aluminum. This series is heat treatable and mainly used in aircraft engine parts, rivets and screw products. Most 2. XXX series alloys are considered poor for arc welding because of their sensitivity to hot cracking. These alloys are generally welded with 4. Exceptions to this are alloys 2. Manganese 3. XXX series added to aluminum yields a nonheat treatable series used for general purpose fabrication and build up. Moderate in strength, the 3. XXX series is used for forming applications including utility and van trailer sheet. It is improved through strain hardening to provide good ductility and improved corrosion properties. Digitus Treiber Windows 7. Typically welded with 4. XXX series is excellent for welding and not prone to hot cracking. Its moderate strengths do prevent this series from being used in structural applications. Silicon 4. XXX series reduces the melting point of aluminum and improves fluidity. Its principle use is as filler metal. The 4. XXX series has good weldability and is considered a nonheat treatable alloy. Alloy 4. 04. 7 is becoming the alloy of choice in the automotive industry, as it is very fluid and good for brazing and welding. Magnesium 5. XXX series, when added to aluminum, has excellent weldability with a minimal loss of strength and is basically not prone to hot cracking. In fact, the 5. XXX series has the highest strength of the nonheat treatable aluminum alloys. It is used for chemical storage tanks and pressure vessels at elevated temperatures as well as structural applications, railway cars, dump trucks and bridges because of its corrosion resistance. It looses ductility when welded with 4. XXX series fillers due to formation of Mg. Si. Silicon and Magnesium 6. XXX series combine to serve as alloying elements for this medium strength, heat treatable series. It is principally used in automotive, pipe, railings, structural and extruding applications. The 6. XXX series is somewhat prone to hot cracking, but this problem can be overcome by the correct choice of joint and filler metal. This series can be welded with either 5. XXX or 4. XXX series without cracking adequate dilution of the base alloys with selected filler alloy is essential. A 4. 04. 3 electrode is the most common for use with this series. Zinc 7. XXX series added to aluminum with magnesium and copper produces the highest strength heat treatable aluminum alloy. Long Winter Game Of Thrones on this page. It is primarily used in the aircraft industry. The weldability of the 7. XXX series is compromised in higher copper grades, as many of these grades are crack sensitive due to wide melting ranges and low solidus melting temperatures. Grades 7. XXX fillers. Other elements 8. XXX series that are alloyed with aluminum i. Most of these alloys are not commonly welded, though they offer very good rigidity and are principally used in the aerospace industry. Filler metal selection for these heat treatable alloys include the 4. XXX series. Pure Aluminum 1. XXX series, though not an alloying element, is considered nonheat treatable and is used primarily in chemical tanks and piping because of its superior corrosion resistance. This series is also used in electrical bus conductors because of its excellent electrical conductivity. XXX series are easily welded with 1. In addition to the primary aluminum alloying elements, there is a number of secondary elements, which include chromium, iron, zirconium, vanadium, bismuth, nickel and titanium. These elements combine with aluminum to provide improved corrosion resistance, increased strength and better heat treatability. Physical Properties. Now that you have a basic background on aluminum metallurgy, we will move into the physical properties of base metal aluminum and how it compares to other metals, primarily steel. The reason why aluminum is becoming specified for so many jobs is its physical properties. SAQA Technician Foundation Certificate in Jewellery Design and Manufacturing offered by the Vocational Training Council. Curriculum covers. Vocational English Communication Skills, Jewellery Design, Jewellery Illustration, Basic Materials, Practical Computer Application, Professional Goldsmithing, Lost Wax Casting. The structure of the certificate is similar, however no judgement could be made on the level but it seems to be at a slightly lower level than this FETC Jewellery Manufacturing Operations as only a few elements of competence were found that would compare favourably with the proposed qualification. School for art and Technical Education in Jewellery Hong Kong Certificate In Jewellery Design http www. Jewellercourses. Top. This is four month short term course is introduced for people who want to pursue conventional jewellery designing. At the end of the course, the students are able to. Design jewellery on paper using the most advanced rendering techniques. Understand conventional jewellery manufacturing processes. Some key roles and competencies were found in the module understand conventional jewellery manufacturing processes however no judgement could be made on the level and depth of the outcomes. MEM9. 8. pdf. wwwfp. Vocational. PathwayFundedPathHistory. The FETC Jewellery Manufacturing Operations matches very closely in terms of qualification purpose, structure, entry level, credits and outcomes with the Certificate III in Jewellery Manufacture apprenticeship offered by the Department of Education and Training, Australia. Favourable comparisons were found in terms of the outcomes for Occupational Health and Safety, Organising and analysing information, operate in a work based team environment, measure with graduated device, perform computer operations, Operate and monitor machineprocess, perform gemstone setting, handle and examine gemstone materials, produce rubber moulds for lost wax casting process and perform hand engraving. Outcomes or competencies identified in the Certificate III in Jewellery Manufacture are generally quite comparable to the South African qualification in terms of levels and range of competencies covered. Both provide a firm foundation for further study at the higher levels. This apprenticeship is also offered in Tasmania. Gemmological Institute of America GIA Thailand. Programmes offered include Graduate Jeweller Diploma and Applied Jewellery Arts Diploma Program. The curriculum covers. Learn to illustrate shape, form, and texture of metal. Learn leading edge 3 D technology to design jewellery using CAD computer aided design software. Create a wide variety of designs in wax. Use your own designs to make complete models for casting and mould making. Explore the art of vulcanised rubber and R. T. V. Room Temperature Vulcanising mould making and cutting techniques. Learn the art of cutting a mould. Work with metals including how to melt, pour, roll, form, and solder. Learn how to file, pierce, and polish metal. Learn to perform the most common repair requests, including sizing rings, repairing chains, replacing earring posts, and resetting stones. Use laser welding technology to manufacture or repair jewellery and reduce your production time. Learn the basics of working with gemstones. Learn how to set stones by working with a variety of mounting styles, settings, and fancy shape stones. Similar competencies were found and the outcomes of the programmes match closely with the outcomes of the unit standards covered in this FETC. Certificate2. 0Programmes. Art and Design Institute offer courses in. Jewellery Manufacturing Part I. Properties of metals, alloys, terminologies in manufacturing. Tools used in Jewellery manufacturing, utility limitations of important tools. Cutting and bending, pattern and texture, fusing and soldering, cold joining, finishing, patinas, stone setting, mechanism chains. Jewellery Manufacturing Part II. Making earrings, chains, pendants. Similar competencies were found and the outcomes of the courses offered here match closely with the outcomes of the unit standards and key competencies covered in this FETC. Jewellery Manufacturing Operative Traineeship. Course description. This course has been designed in order to provide trained personnel for the jewellery industry. The aim of the course is to develop the skills and related knowledge in all aspects of jewellery production. Career planning and job seeking skills. Formingfilingpolishing. Induction. Sawing piercing. Soldering. The course compares favourable in terms of purpose, similar competencies match, however no judgement could be made on the entry level. Similar competencies were found that compare favourable to this FETC in terms of casting, soldering, stone setting, formingfilingpolishing as well as sawing and piercing. The FETC Jewellery Manufacturing Operations compares favourable with a wide selection of international qualifications, programmes, courses identified above. Where outcomes or competencies were identified within the international qualifications, programmes or courses, they are generally quite comparable to the South African qualification in terms of competencies covered.